Josmen said:Well, the 3.27 gears are wearing bad and starting to howl, and I have the 3.55 gears for free and not a lot of cash to buy new ones anyways. So just to get it back on the road I think I might go with the 3.55 gears. Thanks for the info!
Dan
Mel96GT said:For that cheap go for it! Anything is better than those 3.27's. The 3.55's are actually perfect with the stock NPI cams, IMHO, since the stock NPI engine redlines at 4500 rpm and it is slightly torquier at low rpm's than the PI engine. With 3.27's I would do 70 at 2100 rpm's, where now with 3.55's I do 70 at 2300 rpm's.
You will notice improved acceleration (at least I did) with 3.55's, and your gas mileage and top end will be the same. In fact, a friend of mine started installing 3.55's in some of the Crown Victoria cop cars he services and the guys love them since the acceleration is improved without affecting top end. Don't forget to buy a new 3.55 speedo gear for the tranny. I don't think you will be too disappointed. Let us know how you like them.
MBDiagMan said:Going to a lower gear (higher numerically) will likely INCREASE your top speed, not lower it. This is due to the torque multiplication allowing the engine to overcome the wind resistance and other factors that fight against faster speed.
These cars have overdrive final ratios and high RPM torque peaks. 4.10's are not unreasonable gears, even for highway driving.
merc123 said:I hope your joking about top speeds...that's the math.
Engine RPM: 6200
Vehicle Speed: 186.755285063091
Read End Gear: 3.73
Engine RPM: 6200
Vehicle Speed: 213.026670729459
Read End Gear: 3.27
Mel96GT said:That math only works if the car is in a vacuum, i.e. no atmosphere. The reality is wind resistance which is a function of the square of the speed. That is what MBDiagMan was alluding to. It basically takes twice the energy to go 100 mph compared to 70 mph because of wind resistance. That is where the torque multiplication comes in with lower gears. A Mustang with 3.27's will NEVER get to 213 mph without a heavily modded engine and aerodynamics.
stangGT97 said:The max theoretical speed of a car will always decrease as it gets geared lower (ie, going from 3.27 to 4.10). At the same time, however, the max attainable speed will increase due to the extra torque multiplication giving your car the ability the extra power to overcome wind resistance.
jstreet0204 said:What? You mean he your car wouldn't go 213mph stock? You better get it check out. You must have gotten a lemon.
stangGT97 said:My car has the NPI speed limiter mod
Did my reasoning not make sense?
jstreet0204 said:Yeah, I understand. I put 4.10's in as a speed limiter. 200mph + was just a little too fast for me. I figured if I could only do 180 it would be a little safer
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